import 'package:flutter/material.dart';
import 'package:english_words/english_words.dart';

void main() => runApp(new MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
        title: 'Welcome to Flutter',
        theme: new ThemeData(
          primaryColor: Colors.white,
        ),
        home: new Scaffold(
          appBar: new AppBar(
            title: new Text('Welcome to Flutter'),
          ),
          body: new Center(
            child: new RandomWords(),
          ),
        ));
  }
}

class RandomWordsState extends State<RandomWords> {
  final _suggestions = <WordPair>[];
  final _biggerFont = const TextStyle(fontSize: 18.0);
  final _saved = new Set<WordPair>();
  void _pushSaved() {
    Navigator.of(context).push(
      new MaterialPageRoute(
          builder: (context) {
            final tiles = _saved.map(
                (pair) {
                  return new ListTile(
                    title: new Text(
                      pair.asPascalCase,
                      style: _biggerFont,
                    ),
                  );
                }
            );
            final divided = ListTile
                .divideTiles(
                  context: context,
                  tiles: tiles,
                )
                .toList();
            return new Scaffold(
              appBar: new AppBar(
                title: new Text('Saved Suggestions'),
              ),
              body: new ListView(children: divided),
            );
          }
      )
    );
  }
  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(
        title: new Text('Startup Name Generator'),
        actions: <Widget>[
          new IconButton(icon: new Icon(Icons.list), onPressed: _pushSaved)
        ],
      ),
      body: _buildSuggestions(),
    );
  }
  Widget _buildSuggestions() {
    return new ListView.builder(
      padding: const EdgeInsets.all(16.0),
      itemBuilder: (context, i) {
        if (i.isOdd) return new Divider();
        final index = i ~/ 2;
        if (index >= _suggestions.length) {
          _suggestions.addAll(generateWordPairs().take(10));
        }
        return _buildRow(_suggestions[index]);
      },
    );
  }
  Widget _buildRow(WordPair pair) {
    final alreadySaved = _saved.contains(pair);
    return new ListTile(
      title: new Text(
        pair.asPascalCase,
        style: _biggerFont,
      ),
      trailing: new Icon(
        alreadySaved ? Icons.favorite : Icons.favorite_border,
        color: alreadySaved ? Colors.red : null,
      ),
      onTap: () {
        setState(() {
         if (alreadySaved) {
           _saved.remove(pair);
         } else {
           _saved.add(pair);
         }
        });
      }
    );
  }
}

class RandomWords extends StatefulWidget {
  @override
  createState() => new RandomWordsState();
}
